header{
	display: block;
	margin: 0 auto;
	width: 500px;
	text-align: center;
}
header button{
	display: block;
	margin: 20px auto;
	width: 100px;
	padding: 10px 5px;
	border-radius: 8px;
	background-color: #8F7A66;
	color: white;
}
header p{
	display: block;
	margin: 20px auto;
	width: 100px;
	padding: 10px 10px;
}
#gird-container{
	width: 460px;
	height: 460px;
	padding: 20px;
	margin: 50px auto;
	background-color: #BBADA0;
	position: relative;
	border-radius: 10px;
}
.grid-cell{
	width: 100px;
	height: 100px;
	border-radius: 6px;
	background-color: #ccc0b3;
	position: absolute;
}
.num-cell{
	border-radius: 6px;
	font-weight: bold;
	position: absolute;
	font-size: 50px;
	text-align: center;
	line-height: 100px;
	width: 100px;
	height: 100px;
}
._0{
	color: #ccc0b3;
	width: 0;
	height: 0;
}
._2{
	background-color: #eee4da;
}
._4{
	background-color: #ede0c8;
}
._8{
	background-color: #f2b179;
}
._16{
	background-color: #f59563;
}
._32{
	background-color: #f67c5f;
}
._32{
	background-color: #f65e3b;
}
